Here is everything you need to know about unarc.dll and how to fix the error safely. First, the good news: You do not permanently "own" this file.
What is unarc.dll? (And Why You Shouldn’t Download It from “DLL Sites”) unarc.dll download
unarc.dll is not a Windows system file. It is a dynamic link library created by a company called —the creator of the WinRAR archiving format. Specifically, this DLL handles UnARC (Unzip Archive). Here is everything you need to know about unarc